102640049 has 2 divisors, whose sum is σ = 102640050. Its totient is φ = 102640048.

The previous prime is 102639997. The next prime is 102640073. The reversal of 102640049 is 940046201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53919649 + 48720400 = 7343^2 + 6980^2 .

It is a cyclic number.

It is not a de Polignac number, because 102640049 - 2¹⁶ = 102574513 is a prime.

It is not a weakly prime, because it can be changed into another prime (102640649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51320024 + 51320025.

It is an arithmetic number, because the mean of its divisors is an integer number (51320025).

Almost surely, 2^102640049 is an apocalyptic number.

It is an amenable number.

102640049 is a deficient number, since it is larger than the sum of its proper divisors (1).

102640049 is an equidigital number, since it uses as much as digits as its factorization.

102640049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 102640049 is about 10131.1425318174. The cubic root of 102640049 is about 468.2081296609.

The spelling of 102640049 in words is "one hundred two million, six hundred forty thousand, forty-nine".